Oscars ceremony

using System;

namespace OscarsCeremony
{
    class Program
    {
        static void Main()
        {
            int hallRent = int.Parse(Console.ReadLine());
            double statues = hallRent * 0.7;
            double catering = statues * 0.85;
            double soundSystem = catering / 2;
            double sum = hallRent + statues + catering + soundSystem;
            Console.WriteLine($"{sum:f2}");
        }
    }
}